SCALING AND RELATIVE SIZE EFFECTS ON THE HYDRODYNAMIC INTERACTION ON AN UUV OPERATING CLOSE TO A SUBMARINE

摘要

The hydrodynamic interaction effects on an Unmanned Underwater Vehicle (UUV) operating in close proximity to a moving submarine can adversely affect the safety and handling of the former. This paper outlines the steady-state interaction forces and moments acting on an UUV at relative longitudinal locations along the submarine, as well as varying the submarine length to diameter ratio to identify its effects on the interaction behaviour. The results presented are from a series of model scale and full scale Computational Fluid Dynamics (CFD) simulations on axisymmetric UUV and submarine models at diameter ratios of 2.239 and 14.634; and length ratios of 12.362, 14.217, and 16.349 between the two vehicles, with validation carried out for the lower diameter ratio at model scale using captive model experiments. The implications on the full scale results are also presented.